Gaia, Gæa, or Gaea is the mother earth goddess from Greek Mythology. She birthed the Titans and the other gods and was born from the primordial being, Chaos. She had also conceived the Cyclops and the Hecatonchires with Uranus, who later shunned them and hid them in Tartarus, rejoicing in his evil doing. She later birthed Echidna and Typhon.
Gaia often symbolizes power, chaos and triumph of one individual. The term Gaia is also associated with a recurring Cult throughout the series, namely the Ring of Gaea, and is also associated with the 'Chaos' alignment.
Megami Tensei
Gaia is a thief found in the Mazurka Corridor who stole the Silver Relief and is attempting to kill Hecate, the ruler of the area. When Nakajima finds him, Gaia demands that he gives him all of his Macca if he wants the Silver Relief. Once Nakajima pays the thief, he hands over the treasure and runs off.
Shin Megami Tensei III: Nocturne
The Gaea magatama is obtained in Mantra HQ, locked behind a heavy door which the Demi-fiend cannot open without a base strength of at least 24.
Last Bible II
Gaia can be hatched from an Egg, received from an old man in Elba, after beating the game.
Persona 2: Innocent Sin
The Gaia demon can be found as a rare encounter in the deepest area of the Abandoned Factory. After being defeated, Gaia drops the Cradle of Creation Material Card, allowing the player to summon her as a Persona in the Velvet Room. Upon being defeated once, the demon form of Gaia can't be encountered again.
Empress
